Time left 0:52:13 Question 1 Not yet answered Marked out of 4.00 Not flaggedFlag question Question text The length of me

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Time left 0:52:13 Question 1
Not yet answered Marked out of 4.00 Not flaggedFlag question
Question text The length of member BC in the Figure below is 60
mm.
Determine the angle ϕ.
A. ϕ=sin−1[20 mm⋅sin115∘60 mm]
B. ϕ=sin−1[20 mm⋅sin15∘60 mm]
C. ϕ=sin−1[20 mm⋅sin115∘70.81 mm]
D. ϕ=sin−1[60 mm⋅sin65∘70.81 mm]
E. ϕ=sin−1[70.81 mm⋅sin15∘20 mm]